Question

A)2×(2целых 3/4а+3целых)+2целых1/2а если а=2 целых 3/5​

Answer 1

Ответ:

26,8

Пошаговое объяснение:

2·(2 3/4 ·a+3)+2 1/2 ·a=2·(11/4 ·a +3) +2 1/2 ·a=5,5a+6+2,5a=8a+6=2·(4a+3)=2·(4·13/5 +3)=2·(10,4+3)=26,8

Answer 2

To solve the expression, first, we need to substitute the value of "а" into the given expression. Given that "а = 2 целых 3/5," we can perform the substitution and simplify the expression step by step.

Step 1: Replace "а" with its value а = 2 целых 3/5 So, 2 целых 3/4 а = 2 целых 3/4 × 2 целых 3/5 = 2 целых 3/4 × 13/5 = 2 целых (3/4) × (13/5) = 2 целых 39/20.

Step 2: Simplify the expression inside the parentheses 2 целых 3/4 а + 3 целых = 2 целых 39/20 + 3 целых.

Step 3: Add the fractions and the whole numbers separately 2 целых 39/20 + 3 целых = 2 целых + 39/20 + 3 целых.

Step 4: Convert the mixed fractions to improper fractions 2 целых + 39/20 + 3 целых = (2 × 20 + 39)/20 + 3 целых = (40 + 39)/20 + 3 целых = 79/20 + 3 целых.

Step 5: Add the fractions 79/20 + 3 целых.

Step 6: Convert the improper fraction back to a mixed fraction 79/20 can be simplified to 3 целых 19/20.

Now, we have: 2 целых 3/4 а + 3 целых = 2 целых 39/20 + 3 целых = 3 целых 19/20 + 3 целых.

Step 7: Add the whole numbers 3 целых 19/20 + 3 целых = 6 целых 19/20.

Step 8: Finally, substitute the value of "а" into the second part of the expression 2 целых 1/2 а = 2 целых 1/2 × 2 целых 3/5 = 2 целых 1/2 × 13/5 = 2 целых (1/2) × (13/5) = 2 целых 13/10.

Now, we have the entire expression: 2 × (2 целых 3/4 а + 3 целых) + 2 целых 1/2 а = 2 × (6 целых 19/20) + 2 целых 13/10.

Step 9: Multiply and add the fractions and whole numbers 2 × (6 целых 19/20) = 12 целых 38/20 = 12 целых 1/2.

Now, we have: 12 целых 1/2 + 2 целых 13/10.

Step 10: Convert 13/10 to a mixed fraction 13/10 can be simplified to 1 целых 3/10.

Now, we have: 12 целых 1/2 + 2 целых 1 целых 3/10.

Step 11: Add the whole numbers 12 целых + 2 целых = 14 целых.

Step 12: Add the fractions 1/2 + 3/10 = (5/10) + (3/10) = 8/10.

Step 13: Simplify the fraction 8/10 can be reduced to 4/5.

So, the final result is: A = 14 целых 4/5.